Scarlet Spider, Kaine is a uncommon Legendary Creature — Spider Human Hero card from Marvel's Spider-Man (SPM), collector number 143. Current market price: $0.24 (foil $0.24), TCGplayer market prices via Scryfall.
Menace (This creature can't be blocked except by two or more creatures.) When Scarlet Spider enters, you may discard a card. If you do, put a +1/+1 counter on him. Mayhem {B/R} (You may cast this card from your graveyard for {B/R} if you discarded it this turn. Timing rules still apply.)